The savings will come to subscribers who add more devices like tablets to their plans. In such cases, the new pricing system will be cheaper compared with separate data plans for each device. Today, few consumers put tablets on data plans, probably because they dread paying an extra $30 or so per month, on top of their phone bills.Under "Share Everything," adding a tablet to a plan will cost $10 per month. Adding a USB data stick for a laptop will cost $20. Verizon's limited-calling and texting plans will disappear, except for one $40-per-month plan intended for "dumb" phones. Verizon is keeping its limited-data plans for single non-phone devices, like the $30 tablet plan. Current Verizon customers will be able to switch to the new plans or keep their old ones, with one exception. Those who have unlimited-data plans for their smartphones won't be able to move those to new phones, unless they pay the full, unsubsidized price for those phones. (For example, an iPhone 4S that costs $200 with a two-year contract costs $650 unsubsidized, with no contract.) Verizon stopped signing people up for unlimited-data plans last summer. The industry as a whole is moving away from the plans, since the data capacity of their networks is limited. Under the new plans, subscribers can stop worrying about monitoring the number of calling minutes or text messages their families use in a month, but they'll have to keep a close eye on data consumption. Verizon will allow subscribers to adjust their data allowance from month to month, but if they go over their monthly allotment, that will cost $15 per gigabyte. The data allowances start at $50 per month for 1 gigabyte. That's enough for prudent two-smartphone users who use Wi-Fi a lot, but Verizon recommends getting 2 gigabytes for $60. After that, each additional 2 gigabytes cost an extra $10 per month.